Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..106c&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 106-107 (SEE N93-26706 10-90)
Physics
Galactic Clusters, Ionizing Radiation, Lyman Alpha Radiation, Red Shift, Star Distribution, Hydrogen, Neutral Gases, Stellar Magnitude, Stellar Mass
Scientific paper
The detection of 2 x 10(exp 14) solar mass of neutral hydrogen at a redshift of 3.397 has been reported. Top-down theories of structure formation predict such a mass of hydrogen collapsing to form a protocluster of galaxies. We sought to observe this object in Lyman-alpha, which could be produced through ionization by the metagalactic ionizing radiation field or through internal ionization processes. On 29 Apr. 1992, the region of the reported HI emission for 1800 seconds with the 1.3 meter McGraw-Hill reflector at Michigan-Dartmouth-M.I.T. Observatory was observed. Because the H1 emission reported has a transverse scale of 300 sec, a 1/3.06 reducing camera and a Thomson CCD were used to obtain a field of view of about 600 sec by 840 sec. A filter 88 A wide, centered at 5354 A was used; Lyman-alpha emission at z = 3.4 is redshifted to 5347 A. In order to avoid saturating the CCD with a bright star in the field, nine 200 second exposures were taken. The combination of these images shows no obvious extended Lyman-alpha emission at a level of about 28 magnitudes per square arcsecond. The field observed also shows a distant cluster of galaxies. In order to determine if the cluster could in any way be associated with the cloud of neutral hydrogen at z = 3.4, we sought to estimate its redshift from the size and magnitude of the galaxies and of the cluster as a whole. Omega = 1 and H(sub O) = 50 km s(sup -1) Mpc(sup -1) were adopted; our redshift estimates range from z = 0.2 to z = 0.6. The cluster is clearly not associated with the HI cloud at z = 3.4.
Bregman Joel N.
Cox Caroline
Schulman Eric
No associations
LandOfFree
Searching for Lyman alpha emission from a possible Zel'dovich pancake does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Searching for Lyman alpha emission from a possible Zel'dovich pancake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Searching for Lyman alpha emission from a possible Zel'dovich pancake will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1259479